Ruby Error Base Class

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http://ruby-doc.org/core-1.9.3/Exception.html#method-i-message I would opt for redefining to_s/to_str or the initializer. Hot Network Questions What to do with my pre-teen daughter who has been out of control since a severe accident? regards, Gen.lostwarrior http://www.skorks.com Alan Skorkin Thanks man, yeah I saw the comment and replied. Exception Descendants of class Exception are used to communicate between Kernel#raise and rescue statements in begin ... check over here

What I do know You can declare your custom error class and let it inherit from StandardError, so it can be rescued: class MyCustomError < StandardError end This allows you to When I say at least, this means the further down the inheritance you can go, the better. C clear, count D delete E each, empty? Sorry, I don't know modules very well in Ruby, but most definitely the base class is going to be StandardError. check here

Ruby Exception Class

But, I think all the stuff I've been writing about Ruby lately has taken on a life of it's own for me :), so I am going to quickly go over false : self.superclass.has_module?(module_ref) end end end StandardError.has_module?(A::B::Error) NameError.has_module?(A::B::Error) Regarding your second question I can't see anything better than begin #do AWS error prone stuff rescue Exception => e if Amazon::AWS::Error.constants.include?(e.class.name) #awsError This for good reason: SystemExit, Interrupt (caused by ctrl-C) and some others that you shouldn't want to rescue per default are not StandardErrors but inherit from Exception directly. person.errors[:name] # => ["cannot be nil"] person.errors.set(:name, ["can't be nil"]) person.errors[:name] # => ["can't be nil"] Source: show | on GitHub # File activemodel/lib/active_model/errors.rb, line 138 def set(key, value) ActiveSupport::Deprecation.warn(" ActiveModel::Errors#set

Anything that is a subclass of Exception will return itself when exception is called so you can do things like raise Exception.new("Something is wrong"). Ruby Custom Exception Java has the finally keyword for this, Ruby has ensure. By supplying a to_str method, exceptions are agreeing to be used where Strings are expected. Browse other questions tagged ruby exception metaprogramming or ask your own question.

csam Great infor helped me alot. Ruby Argumenterror How I can teach upper class to understand that he owns RequestTimeout? :( Moreover, if BaseService is provided by API and sub class (3rd party) is using it there is no The class raising the exceptions is a fake API to Cloudinary. Delete remote files matching local files, or delete files as they are downloaded What is Salesforce DX?

end key?(attribute) Link Alias for: include? check my blog writing logs in custom exception class?3Ruby: selective class inheritance?1custom exception class not printing message in eclipse1Custom Exception Class - Why do we need it? For example, if we are reading from a file, we want to close the file handle no matter if an exception is thrown or not, we can do the following: file If you're given an hour, is it bad to finish a job talk in half an hour? Ruby Standard Error

value.empty? : false add(attribute, :empty, options) if value.nil? || is_empty end end added?(attribute, message = :invalid, options = {}) Link Returns true if an error on the attribute with the given http://entp.com Jeremy Do *not* inherit new exceptions from Exception. Let us demonstrate: begin 1/0 p 'I should never get executed' rescue p 'I am rescuing an exception and can do what I want!' end This produces the following output: "I http://iisaccelerator.com/ruby-exception/ruby-error-exception.php I include?

It's these kinds of little shortcuts that really make me dig Ruby. Ruby Exception Backtrace This method is similar to #backtrace, but the backtrace is an array of Thread::Backtrace::Location. share|improve this answer answered Feb 9 at 19:16 Huliax 4831617 add a comment| up vote 0 down vote Given what the ruby core documentation of Exception, from which all other errors

You could also add more arguments to the method signature, should you need.

This is because exceptions that inherit from StandardError deal with application level errors, while if you inherit Exception directly you risk catching errors to do with the environment. Of course, if you extend your object with ActiveModel::Translation you will not need to implement the last two. Are those executed ? Rails Exception Handling share|improve this answer answered Oct 5 '09 at 0:39 Peter Wagenet 4,6251625 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google